Water-tube connection



June l5, 1926.

1,589,209 J. F. MOCK WATER TUBE CONNECTION Filed August 27, 1925 l/ /0 B E @Y l s LNVENTOR 1,589,209 natriuraerien.

JOI-IN F. MDCK, vOF HILLIPSBURG, NEW JERSEY, ASSIGNOR TO INGERSOLL-RAND COMPANY, OF JERSEY CITY, NEW JERSEY, A CORPORATION OF NEW ERSEY.

i WATER-TUBE CONNECTION.,

Application filed August 27, 1925. Serial No. 52,951.

This invention relates to rock drills,but more particularly to a water tube connection for fluid actuated rock drills of the hammer type.

The objects of the invention are to prevent leakage of water from the back head into the cylinder of the drill, to prevent wear between the water tube and its seat and to eliminate the necessity of frequent inspection of the water tube and associated parts.

Other objects will be in part obvious and in part pointed out hereinafter.

The invention consists'of the combinations of elements, features of construction and arranoement of )arts havin@V the eneral mode of operation substantially as hereinafter described and more particularly pointed out in the appended claims and illustrated in the accompanying drawings, in which- Figure l is an elevation, partly in section, of a rock drill equipped with a water tube connection constructed in accordance with the practice of the invention, and

Figure 2 is anenlarged detailview of a portion of the back head and the water tube connection. l

Referring to the drawings, the invention is shown embodied ina drill having a cylinder A, a front head B and a back head C, which parts comprise the casing of the drill and are held in operative position by a pair of side bolts D, only a portion of one of which is shown, arranged on opposite sides of thel drill. The cylinder A is provided with a hammer piston E, only the nose of which is shown, for delivering blows on a hollow drill steel F supported by a chuck G in the front head B.

Pressure fluid for operating the drill is conveyed through a suitable connection H which in this instance is secured t0 a valve chest J bolted to the cylinder A, as by means of bolts K. A distribution valve (not shown) of any suitable type may be arranged in a valve chest J for distributing the pressure fluid to the opposite ends of the cylinder A to reciprocate the piston E.

In accordance with the practice of the invention, a recess L is formed in the back head C to receive a water tube O. The water tube O in this instance is provided with a bulb P near one end and extends thro-ugh the cylinder A and the piston E into the rearward end of the drill steel F for the purpose of conveying cleansing of the water tube O. rlhe inner end of the bore R terminates in a tapered seat Swhich cooperates with they bulb P of the tube O to form a fluid tight joint therebetween. VIf desired, a gasket T of' any suitable material may be compressed between the shoulder U Vof the water plug Q and the back head Cv to insure perfect sealing.

In order to prevent undue wear on the bulb P when the water plug Q, is screwed in position and such wear as may be caused by Vvibration set up in the drill during its operation, a disk V slidable in the recess L encircles the tube O and forms a seatfor the bulb P. In order to more thoroughly prevent leakage of water along the tube into the cylinder Afa packing W of any suitable compressible material, such as rubber, is arranged about the tube O and beneath the disk V, and is preferably provided with a washer X which acts vas a seat for one end of a compression spring Y seated with its other end on the bottom of therecess L for holding the disk V firmly against j the bulb l? and for compressing the packing WV.

In this instance, an annular groove Z isv formed around the outside of the water plug' Q and communicates with the bore R of said tube through transverse passages Z2 and also communicates with a water connection c, screwed in the back head or otherwise secured thereto, through a passage d.

From the foregoing description, it will be seen that the water tube is effectively sealed Vto prevent leakage. of water therefrom into the percussive element of the drill, and that any wear which may take place between the bulb P and its sea-t will be automatically compensatedv for by the compressive action of the spring Y. By this form of construction the water tube and its associated parts may be assembled in the back head and the proper adjustments made at the time the drill is assembled and thereafter will require no more attention on the part of the operator.

1. In a fluid actuated rock drill, the combination ot a cylinder and e back head, a recess in the back head, a. water tube eX- tending through the cylinder and into the recess, a` bulb near one end of the tube, a disk slidable in the recess forming a seat i'or tle bulb, e Water plug to receive the end of the tube and cooperating With the bulb to limit endwise movementof the tube in one direction, a shoulder on said Water plug to cooperate with the back head for limiting' inward movement of the Waterr plug with respect to the back head, and a spring beneath the disk for holding` the disk firmly against the bulb and for holding the tube yieldably in the water plug.

ln a Huid actuated rock drill, the combination or' a cylinder and a back head, a

recess in the back head, a Water tube in the recess and extending through the cylinder, a bulb near one end oit the tube, a disk slidable in the recess forming;` a seat for the bulb, a compressible packing encircling' the tube beneath the disk, a spring between the 'packing and the bottom ot the recess for automatically compressing` the packingV and .tor forcing the disk iirmly against the bulb, a Water plug to receive one end of the tube, and a shoulder on the water tube to cooperate with an end ot' the back head for sealing the recess.

In testimony whereof I have signed this specification.

JOHN F. MOCK. 

